[R] Plotting a Trivial Matrix
Dear All, Consider a matrix (N x N) where each entry is either zero or one (can hardly get any simpler). Now, I would like to plot it as a 'chessboard' where every matrix entry is a black (1) or white (0) square. Whatever tool I use to plot it, it should not try to interpolate the data at all. I found some online references http://www.phaget4.org/R/image_matrix.html but probably I can resort to something much simpler. Can anyone provide me with a simple example I can modify later on? Many thanks Lorenzo __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Plotting a Trivial Matrix
Hi,
A minimalist example using Grid graphics,
library(RGraphics)
bwImage - function(m, cols=c(white, black),
draw=TRUE, gp=gpar()){
g - imageGrob(nrow(m), ncol(m),
cols=cols[m+1], gp=gp)
if(draw)
grid.draw(g)
return(g)
}
m - matrix(rnorm(200) 0, ncol=20)
bwImage(m)
HTH,
baptiste
On 26 February 2010 09:29, Lorenzo Isella lorenzo.ise...@gmail.com wrote:
Dear All,
Consider a matrix (N x N) where each entry is either zero or one (can
hardly get any simpler).
Now, I would like to plot it as a 'chessboard' where every matrix entry
is a black (1) or white (0) square.
Whatever tool I use to plot it, it should not try to interpolate the
data at all.
I found some online references
http://www.phaget4.org/R/image_matrix.html
but probably I can resort to something much simpler.
Can anyone provide me with a simple example I can modify later on?
Many thanks
Lorenzo
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
--
Baptiste Auguié
Departamento de Química Física,
Universidade de Vigo,
Campus Universitario, 36310, Vigo, Spain
tel: +34 9868 18617
http://webs.uvigo.es/coloides
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] Plotting a Trivial Matrix
On 02/26/2010 07:29 PM, Lorenzo Isella wrote: Dear All, Consider a matrix (N x N) where each entry is either zero or one (can hardly get any simpler). Now, I would like to plot it as a 'chessboard' where every matrix entry is a black (1) or white (0) square. Whatever tool I use to plot it, it should not try to interpolate the data at all. I found some online references http://www.phaget4.org/R/image_matrix.html but probably I can resort to something much simpler. Can anyone provide me with a simple example I can modify later on? Hi Lorenzo, trivial_matrix-matrix(sample(0:1,100,TRUE),nrow=10) require(plotrix) color2D.matplot(trivial_matrix,main=A trivial Plot) Jim __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Plotting a Trivial Matrix
baptiste auguie wrote:
Hi,
A minimalist example using Grid graphics,
library(RGraphics)
bwImage - function(m, cols=c(white, black),
draw=TRUE, gp=gpar()){
g - imageGrob(nrow(m), ncol(m),
cols=cols[m+1], gp=gp)
if(draw)
grid.draw(g)
return(g)
}
m - matrix(rnorm(200) 0, ncol=20)
bwImage(m)
HTH,
baptiste
On 26 February 2010 09:29, Lorenzo Isella lorenzo.ise...@gmail.com wrote:
Dear All,
Consider a matrix (N x N) where each entry is either zero or one (can
hardly get any simpler).
Now, I would like to plot it as a 'chessboard' where every matrix entry
is a black (1) or white (0) square.
Whatever tool I use to plot it, it should not try to interpolate the
data at all.
I found some online references
http://www.phaget4.org/R/image_matrix.html
but probably I can resort to something much simpler.
Can anyone provide me with a simple example I can modify later on?
Many thanks
Lorenzo
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Thanks Augustine and Jim for the prompt reply.
You both answered my question. To avoid another post, I would simply
like to know if something along these lines is doable also with ggplot2.
Many thanks
Lorenzo
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] Plotting a Trivial Matrix
What about http://www.phaget4.org/R/image_matrix.html try function f.matrix.plot Tobias Mathow Forest Research Institute Baden-Wuerttemberg (FVA) Wonnhaldestr. 4, D- 79100 Freiburg Phone: ++49-761-4018-365 www.fva-bw.de -Ursprüngliche Nachricht- Von: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] Im Auftrag von Lorenzo Isella Gesendet: Freitag, 26. Februar 2010 09:30 An: r-help Betreff: [R] Plotting a Trivial Matrix Dear All, Consider a matrix (N x N) where each entry is either zero or one (can hardly get any simpler). Now, I would like to plot it as a 'chessboard' where every matrix entry is a black (1) or white (0) square. Whatever tool I use to plot it, it should not try to interpolate the data at all. I found some online references http://www.phaget4.org/R/image_matrix.html but probably I can resort to something much simpler. Can anyone provide me with a simple example I can modify later on? Many thanks Lorenzo __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Plotting a Trivial Matrix
On 26 February 2010 11:12, Lorenzo Isella lorenzo.ise...@gmail.com wrote: Thanks Augustine and Jim for the prompt reply. You both answered my question. To avoid another post, I would simply like to know if something along these lines is doable also with ggplot2. Many thanks Lorenzo Augustine??? Anyhow, with ggplot2, m - matrix(rnorm(200) 0, ncol=20) require(ggplot2) d - melt(m) qplot(X1, X2, data=d, fill=value, geom=tile) + scale_fill_manual(values=c(white, black)) HTH, baptiste __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
